Structural and physical properties of topological semimetal candidate EuZn<sub>2</sub>As<sub>2</sub>

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APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session V52: Magnetic Topological Materials 7: New Materials

3:00 PM–6:00 PM, Thursday, March 18, 2021

Sponsoring Units: DMP GMAG
Chair: Weiwei Xie, Rutgers, The State University of New Jersey

Abstract: V52.00012 : Structural and physical properties of topological semimetal candidate EuZn₂As₂

5:12 PM–5:24 PM Live

Abstract

Presenter:

Joanna Blawat
(Louisiana State University)

Authors:

Joanna Blawat
(Louisiana State University)

Madalynn Marshall
(Department of Chemistry and Chemical Biology, Rutgers University , Rutgers University, Piscataway, NJ08854, USA)

Huibo Cao
(Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA)

Weiwei Xie
(Department of Chemistry and Chemical Biology, Rutgers University , Rutgers University, Piscataway, NJ08854, USA)

Rongying Jin
(Louisiana State University)

Recent theoretical calculations predict nontrivial topology in magnetic materials, such as EuCd₂As₂, with the type-IV magnetic space group symmetry. We have successfully grown EuZn₂As₂ single crystals with the trigonal structure (P-3m1) as determined by the X-ray diffraction measurements. The magnetic susceptibility, electrical resistivity, and specific heat indicate that EuZn₂As₂ orders antiferromagnetically (AFM) at T_N = 19 K. Single crystal neutron diffraction refinement reveals the A-type AFM structure of Eu with the ordered moment of 7.33μ_B. At T < T_N, the (0 0 ½) peak intensity increases and can be described by (T_N – T/T_N)^2β with β ~ 0.23, implying two-dimensional magnetic ordering. These results indicate that EuZn₂As₂ exhibits the same crystallographic and magnetic structure as that of EuCd₂As₂.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session V52: Magnetic Topological Materials 7: New Materials

Abstract: V52.00012 : Structural and physical properties of topological semimetal candidate EuZn2As2

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Abstract: V52.00012 : Structural and physical properties of topological semimetal candidate EuZn₂As₂